Put oil on a fish we hear (5)
I believe the answer is:
anele
'put oil' is the definition.
'anele' can be an answer for 'oil' (I've seen this in another clue). I am not sure about the 'put' bit.
'a fish we hear' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'on' is the link.
Can you help me to learn more?
(Other definitions for anele that I've seen before include "Embrocate" , "Anoint" , "Give religious blessing to" , "Administer extreme unction" .)