Jet to want to pursue dive bomber initially (5-5)
I believe the answer is:
pitch-black
'jet' is the definition.
(thesaurus)
'want to pursue dive bomber initially' is the wordplay.
'want' becomes 'lack' (synonyms).
'to pursue' says to put letters next to each other.
'dive' becomes 'pitch' (both can mean to fall).
'initially' suggests taking the first letters.
The first letter of 'bomber' is 'b'.
'pitch'+'b'='pitchb'
'lack' after 'pitchb' is 'PITCH-BLACK'.
'to' acts as a link.
(Other definitions for pitch-black that I've seen before include "Completely dark" , "Dreadfully dark" .)