Do some editing, taking Imogen in last (5)
I believe the answer is:
emend
'do some editing' is the definition.
(I've seen this in another clue)
'imogen in last' is the wordplay.
'imogen' becomes 'me' (where the crossword setter is 'Imogen').
'in' means one lot of letters goes inside another.
'last' becomes 'end' (I've seen this in another clue).
'me' going within 'end' is 'EMEND'.
'taking' is the link.
(Other definitions for emend that I've seen before include "Remove faults from" , "Improve by editing" , "Edit, improve" , "Improve (writing)" , "Revise (a text) (E, not A)" .)