Hear an adversary coming (7)

I believe the answer is:

arrival

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'coming' is the definition.
(thesaurus)

'hear an adversary' is the wordplay.
'hear an' becomes 'ar' (I can't justify this - if you can you should give a lot more credence to this answer).
'adversary' becomes 'rival' (I've seen this before).
'ar'+'rival'='ARRIVAL'

Can you help me to learn more?

(Other definitions for arrival that I've seen before include "Appearance, entrance" , "Appearance (at a place)" , "Someone who's just come" , "The reaching of one's destination" , "Advent" .)

I've seen this clue in The Independent.

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