Gawking? Go back and fish! (6)
I believe the answer is:
ogling
'gawking?' is the definition.
The definition and answer can be both to do with perception as well as being present participle verbs.
Perhaps there's an association between them I don't understand?
'go back and fish' is the wordplay.
'back' says the letters should be written in reverse.
'and' says to put letters next to each other.
'fish' becomes 'ling' (ling is a kind of fish).
'go' in reverse letter order is 'og'.
'og'+'ling'='OGLING'
Can you help me to learn more?
(Other definitions for ogling that I've seen before include "Looking lecherously" , "Eyeing lasciviously" , "Leering" , "Eyeing greedily" .)