Collect a bit of Manali dope (5)
I believe the answer is:
amass
'collect' is the definition.
(synonyms)
'a bit of manali dope' is the wordplay.
'bit of' suggests taking the first letters.
'dope' becomes 'ass'.
The initial letter of 'manali' is 'm'.
'a'+'m'+'ass'='AMASS'
(Other definitions for amass that I've seen before include "Accrue, heap up" , "Stock up on" , "Collect or gather" , "Get together" , "Be a compiler" .)