On the way to collect dope and unwilling to reconsider (12)
I believe the answer is:
intransigent
'unwilling to reconsider' is the definition.
(unwilling to change one's mind)
'on the way to collect dope' is the wordplay.
'on the way' becomes 'in transit' (I've seen this before).
'to collect' is an insertion indicator (inserted letters are collected by others).
'dope' becomes 'gen' (both can mean information).
'intransit' enclosing 'gen' is 'INTRANSIGENT'.
'and' is the link.
(Other definitions for intransigent that I've seen before include "Not flexible" , "Not prepared to adapt or compromise" , "unwilling to compromise" , "Irreconcilable" , "Hardliner" .)