Sea creature finds work after a month (7)
I believe the answer is:
octopus
'sea creature' is the definition.
(I've seen this before)
'work after a month' is the wordplay.
'work' becomes 'opus' (an opus is an artistic work).
'after' means one lot of letters go next to another.
'a month' becomes 'Oct' (abbreviation for October).
'opus' after 'oct' is 'OCTOPUS'.
'finds' is the link.
(Other definitions for octopus that I've seen before include "Influential person" , "something from La Mer?" , "Large marine mollusc" , "army swimmer" , "Scoot up (anag.)" .)