Jog around uninhibitedly at first delivering fish (5)
I believe the answer is:
trout
'fish' is the definition.
(trout is a kind of fish)
'jog around uninhibitedly at first' is the wordplay.
'jog' becomes 'trot' ('trot' can be a synonym of 'jog').
'around' indicates putting letters inside.
'at first' suggests taking the first letters.
The initial letter of 'uninhibitedly' is 'u'.
'trot' going around 'u' is 'TROUT'.
'delivering' acts as a link.
(Other definitions for trout that I've seen before include "Mistiness" , "Unattractive old woman" , "Edible fish" , "unpleasant old woman" , "grumpy old woman" .)