Crossword Genius

Eels are wriggling free (7)

Ross

I believe the answer is:

release

'free' is the definition.
(to release someone is to free them)

'eels are wriggling' is the wordplay.
'wriggling' indicates an anagram (letters wriggle or move about).
'eels'+'are'='eelsare'
'eelsare' is an anagram of 'RELEASE'.

(Other definitions for release that I've seen before include "Free - delivery" , "press announcement" , "put out" , "Set free - publish" , "Let go" .)

I've seen this clue in The Globe and Mail.
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