Key point one found in pub relating to supply of men (10)
I believe the answer is:
logistical
'relating to supply of men' is the definition.
I can't tell whether this definition defines the answer.
'key point one found in pub' is the wordplay.
'key point' becomes 'gist' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'found in' means one lot of letters goes inside another.
'pub' becomes 'local' (I've seen this before).
'gist'+'i'='gisti'
'gisti' placed inside 'local' is 'LOGISTICAL'.
Can you help me to learn more?
(Other definitions for logistical that I've seen before include "relating to military ops" , "relating to movement and supply" .)