Back from fishing, discover carp (7)
I believe the answer is:
grumble
'carp' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?
'back from fishing discover' is the wordplay.
'back from' suggests the final letters (the letter at the back of the word).
'discover' becomes 'rumble' (to rumble someone is to discover their secret).
The final letter of 'fishing' is 'g'.
'g'+'rumble'='GRUMBLE'
Can you help me to learn more?
(Other definitions for grumble that I've seen before include "Murmur with discontent" , "Complain, be a grouch" , "Moan" , "Complain, protest" , "bitch" .)