Go along with a third-rate crew? (9)
I believe the answer is:
accompany
'go along with' is the definition.
(thesaurus)
'a third-rate crew?' is the wordplay.
'third-rate' becomes 'c'.
'crew?' becomes 'company' (I've seen this before).
'a'+'c'+'company'='ACCOMPANY'
(Other definitions for accompany that I've seen before include "Travel along with" , "Go with as a companion" , "Unbelief" , "Escort" .)