Give the odd trim to father in it (6)
I believe the answer is:
impart
'give' is the definition.
(I know that give can be written as impart)
'odd trim to father in it' is the wordplay.
'odd' is an anagram indicator.
'to father' becomes 'pa' (pa can mean dad or father).
'in it' means one lot of letters goes inside another.
'trim' with letters rearranged gives 'imrt'.
'imrt' enclosing 'pa' is 'IMPART'.
'the' acts as a link.
(Other definitions for impart that I've seen before include "Reveal details" , "Armpit (anag)" , "Pass on information" , "Contribute" , "Give - convey" .)