Train crack unit here, not hard (7)
I believe the answer is:
retinue
'train' is the definition.
(thesaurus)
'crack unit here not hard' is the wordplay.
'crack' indicates an anagram.
'not' indicates named letters should be taken away.
'hard' becomes 'h'.
'unit'+'here'='unithere'
'unithere' with 'h' taken out is 'unitere'.
'unitere' is an anagram of 'RETINUE'.
(Other definitions for retinue that I've seen before include "Figure out" , "Suite of followers" , "Body of followers" , "Train, escort" , "Attendants, followers" .)