How many letters in the Answer?

The Telegraph - Toughie Dec 22 2015

Brutal person won't want son round BEAT
Captivity of any number in underground activity INTERNMENT
Catmint eaten by one pet apparently NEPETA
Cockney gets duck, Poplar's no. 2 being caught in gully ARROYO
Dancer terribly skinny I judge should be tucking in NIJINSKY
Dire expression when first hint of fear is expressed? GRIMACE
Essential Conservative charm lacking heart? CENTRAL
Excellent bishop, this person's a name for revolutionising country NAMIBIA
Go into school square -- find something poisonous STRYCHNINE
Good girl protected by fellow explorer MAGELLAN
Highest point of a river leading to exclamation of surprise APOGEE
Many a gunboat may be deployed to protect a harbour GUANTANAMOBAY
Mary runs, coming in sixth out of twelve -- one to swear? JURYMAN
Mineral in concrete covering over half of growing area REALGAR
New teacher to help rival educational establishment? THEOTHERPLACE
Nick heading off for island INCH
Notice graduate in work following right plan ROADMAP
Panic about potassium in cosmetic treatment SKINCARE
Person that is dumped by Sally SORT
Presentation rude, not one to entertain old women BESTOWAL
Signal before appearance of wise man PRESAGE
Something bony presents problem when eating bird STERNUM
Spooner's name for pet rabbit, similar creatures being wild animals HONEYBEARS
State of senselessness in places after retreat by soldiers STUPOR
This health professional may briefly suggest an Italian lake COMPANYDOCTOR
Turning violently on traitors, men protest REMONSTRATION
Weak material LAME
Working at basic lab giving fresh opportunity for university don? SABBATICAL
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