Give Dad a part of conditional release (6)
I believe the answer is:
parole
'conditional release' is the definition.
(I've seen this in another clue)
'give dad a part' is the wordplay.
'give' means one lot of letters go next to another.
'dad' becomes 'pa' (pa can mean someone's father).
'a part' becomes 'role' (eg a theatrical role).
'pa' put next to 'role' is 'PAROLE'.
'of' acts as a link.
(Other definitions for parole that I've seen before include "(One's) word" , "Early release on promise of good behaviour" , "Temporary release on promise of good behaviour" , "Release (a prisoner) on the promise of good conduct" , "Conditional release from imprisonment" .)