Crossword Genius

Clergyman pockets a pile (7)

Ross

I believe the answer is:

reactor

'pile' is the definition.
(term for a nuclear reactor)

'clergyman pockets a' is the wordplay.
'clergyman' becomes 'rector' (rector is a kind of clergyman).
'pockets' indicates putting letters inside.
'rector' going around 'a' is 'REACTOR'.

(Other definitions for reactor that I've seen before include "nuclear facility" , "device for generating energy" , "Nuclear power station core" , "Nuclear apparatus for producing energy" , "Nuclear installation" .)

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