How many letters in the Answer?

The Telegraph - Toughie Dec 13 2016

Airmen flying over river to get man on board MARINER
Are hopelessly trapped in dead ends and fear the worst DREAD
Artist uses same plastic to frame 'Model Reflecting' MATISSE
Concerned with job, one needs a break REMISSION
Disproof that crime doesn't pay? WAGESOFSIN
Enlightens about every setback TEACHES
Going on board for a ride SURFING
Having no inclination whatsoever to be honest ONTHELEVEL
In Home Counties, marry European SWEDE
Injection that may be lethal SHOT
It's climbing into cave, hackles up HOSTILE
It's dark when headless horseman appears NIGHT
Madhouse in which Goldilocks found the three beds? BEARGARDEN
On reflection, return the call ECHO
One of our crack composers GAGWRITER
Plans to get close in. Isn't worried INTENDS
Port that's a sanctuary ADEN
Positions, or places, one on the inside, standing up SITES
Rate of scoring TEMPO
See what's wrong when key is inserted WATCH
Shook one's head and said 'Warped by cupidity' DISAGREED
Silly ass I manage to capture: an alien RUSSIAN
Smart to be given hand up, as foreign country INDIA
Spelling aid WAND
Stuff a pancake CREPE
Sun bronze held by tin sprayed and twinkling INSTANT
Thinks crushed ice is kept in coolers FANCIES
Turn it off when people come in for food NUTRIMENT
Turns back to finding prices externally ROTATES
What the old man in paroxysm of wrath is on? WARPATH
Wrap up and go off in pursuit of adjacent quarters SWADDLE
Writes in Chinese, perhaps, 'Prepare to fight' DRAWSWORDS
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