Pull away from Felixstowe (3)
I believe the answer is:
tow
'pull away' is the definition.
(I've seen this before)
'from felixstowe' is the wordplay.
'from' says the answer is hidden in the clue.
'TOW' is hidden within 'felixstowe'.
(Other definitions for tow that I've seen before include "Pull (with rope)" , "Pull along behind, say barge" , "Prepared fibres" , "Pull along (a vehicle)" , "Draw" .)