What one needs to pick up a weapon, maybe (3)
I believe the answer is:
arm
'what one needs to pick up a weapon maybe' is the definition.
I can't tell whether this defines the answer.
'one needs to pick up a weapon maybe' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'needs' means one lot of letters go next to another.
'to pick up' is a reversal indicator.
'a weapon maybe' becomes 'mr' (I can't justify this - if you can you should believe this answer much more).
'mr' reversed gives 'rm'.
'a'+'rm'='ARM'
Can you help me to learn more?
(Other definitions for arm that I've seen before include "Equip with weapon" , "Accoutre" , "Activate warhead" , "Steel" , "Supply weapons" .)