How many letters in the Answer?

The Telegraph - Toughie Aug 12 2014

Agile mole grabs gopher's tail SPRY
Covered in blood, rower shouted noisily ROARED
Dependency on self? I am confused ISLEOFMAN
Eyeing up the girls may cause twitching BIRDWATCHING
Film of oily matter GREASE
Groups in braces put on singles? THREESOMES
Hippie in Germany put work into retreat DROPOUT
Huge mistake to block right to get a raise in charge TERRIFIC
In a sorry state, depressed athlete missing a little time for training DOWNATHEEL
In exuberant style Rome may well start to hang bunting YELLOWHAMMER
Initially iodine treatment can heal skin infection ITCH
Instrument found in boiler house KETTLEDRUM
Mass of seaweed TANGLE
One's against being kept in quarantine ANTI
One's used in knitting leg-bands -- 16 will go round top of thigh GARTERSTITCH
Paid for food FEED
Rendered unconscious from combination of oxygen, steam and carbon monoxide COMATOSE
Shock associated with northern turn's music ROCKNROLL
Slave switched direction to discover identity SELF
Spiritual stronghold AERY
Stay in Dallas involved festival ALLSAINTSDAY
Street above York put up flashing light STROBE
Ten crimes solved -- number getting framed increases INCREMENTS
Threescore years and ten -- if energy's left first, sleep's taken over LIFESPAN
To maintain central core of gas mains is tricky INSIST
Up-and-down experience in the present and past SEESAW
Walker who goes on and on RAMBLER
We old lot could be quids in! WELLTODO
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