Joining military group in Greece (7)

I believe the answer is:

uniting

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'joining' is the definition.
(uniting is a kind of joining)

'military group in greece' is the wordplay.
'military group' becomes 'unit' (group of soldiers).
'greece' becomes 'g' (this might be a standard abbreviation which I don't know about).
'unit'+'in'+'g'='UNITING'

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(Other definitions for uniting that I've seen before include "wedding?" , "Making as one" , "becoming one" , "Joining together" , "Victor --, French author" .)

I've seen this clue in The Mirror.

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