To tie game, one may have been deployed in defence (10)

I believe the answer is:

drawbridge

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'one may have been deployed in defence' is the definition.
I can't judge whether this definition defines the answer.

'to tie game' is the wordplay.
'to tie' becomes 'draw' (synonyms).
'game' becomes 'bridge' (card game).
'draw'+'bridge'='DRAWBRIDGE'

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(Other definitions for drawbridge that I've seen before include "Castle defence" , "for reasons of security" , "Up-and-down opener" , "Barbican may defend this" , "that's raised by defenders" .)

I've seen this clue in The Telegraph.

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