Be consistent at this place, backing firm (6)
I believe the answer is:
cohere
'be consistent' is the definition.
(thesaurus)
'this place backing firm' is the wordplay.
'this place' becomes 'here' (I've seen this in other clues**).
'backing' says to put letters next to each other.
'firm' becomes 'co' (a firm is a company).
'here' put after 'co' is 'COHERE'.
'at' acts as a link.
(Other definitions for cohere that I've seen before include "Fit together" , "Stick together, remain united" , "Stick or hold together and resist separation" , "Hold firmly together" , "Hang together" .)