Crossword Genius

Defender obtains ground (7)

Ross

I believe the answer is:

bastion

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

'obtains ground' is the wordplay.
'ground' indicates an anagram ('grind' the letters into a new form).
'obtains' is an anagram of 'BASTION'.

(Other definitions for bastion that I've seen before include "Obtains (anag.)" , "staunch supporter" , "Stronghold, fortification" , "Projecting part of a fortification" , "that's fortified" .)

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