One opens either end of Chubb-lock with small band (9)
I believe the answer is:
corkscrew
'one opens either end of chubb-lock with small band' is the definition.
I can't judge whether this defines the answer.
'lock with small band' is the wordplay.
'lock with' becomes 'cork' (I am not sure about this - if you are sure you should believe this answer much more).
'small' becomes 's' (abbreviation - e.g. clothes size).
'band' becomes 'crew' (I've seen this before).
'cork'+'s'+'crew'='CORKSCREW'
Can you help me to learn more?
(Other definitions for corkscrew that I've seen before include "Move in a spiral manner" , "handy opener" , "Device used to get at red" , "Wine bottle opener" , "Bottle-opener" .)