Bump into fellow seal hunter back in canteen (4,6)

I believe the answer is:

come across

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'bump into' is the definition.
(synonyms)

'fellow seal hunter back in canteen' is the wordplay.
'fellow' becomes 'co' (eg a co-worker is a fellow worker).
'seal hunter back' becomes 'acro' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'canteen' becomes 'mess' (I've seen this before).
'acro' inserted into 'mess' is 'meacross'.
'co'+'meacross'='COME ACROSS'

Can you help me to learn more?

(Other definitions for come across that I've seen before include "Find accidentally - provide what is necessary" , "provide what is expected" , "Be perceived as" .)

I've seen this clue in The Independent.

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