Notice soldier holding stick out for OC's assistant (8)

I believe the answer is:

adjutant

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'assistant' is the definition.
(I've seen this before)

'notice soldier holding stick out' is the wordplay.
'notice' becomes 'ad' (both can mean an advertisement).
'soldier' becomes 'ant' (soldier is a type of ant).
'holding' means one lot of letters goes inside another.
'stick out' becomes 'jut' (I've seen this before).
'ad'+'ant'='adant'
'adant' placed around 'jut' is 'ADJUTANT'.

'for oc's' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for adjutant that I've seen before include "Officer's assistant" , "one with large bill" , "CO's aide" , "Aide-de-camp" , "Military aide" .)

I've seen this clue in The Independent.

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