Worked beside well (4)
I believe the answer is:
took
'worked' is the definition.
The answer and definition can be both related to bodily activities as well as being past participle verbs.
Perhaps there's a link between them I don't understand?
'beside well' is the wordplay.
'beside' becomes 'to' (I can't explain this - if you can you should give a lot more credence to this answer).
'well' becomes 'O.K.' (synonyms).
'to'+'ok'='TOOK'
Can you help me to learn more?
(Other definitions for took that I've seen before include "Received - stole" , "removed from chessboard" , "Laid hold of" , "Went through" , "Purloined" .)