Crossword Genius

Unavoidably for every constabulary (8)

Ross

I believe the answer is:

perforce

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

'every constabulary' is the wordplay.
'every' becomes 'per' ('per' means 'for each' or 'for every').
'constabulary' becomes 'force' (I can't explain this - if you can you should believe this answer much more).
'per'+'force'='PERFORCE'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for perforce that I've seen before include "Of necessity" , "Necessarily; inevitably" , "By force of circumstance, necessarily" , "without choice" , "willy-nilly" .)

I've seen this clue in The Irish Independent.
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