Crossword Genius

Grannie so loose, working out (9)

Ross

I believe the answer is:

reasoning

'working out' is the definition.

'grannie so loose' is the wordplay.
'loose' indicates an anagram (letters are loosened from their original positions).
'grannie'+'so'='grannieso'
'grannieso' is an anagram of 'REASONING'.

(Other definitions for reasoning that I've seen before include "Thinking that is coherent and logical" , "Debating" , "Train of thought" , "Logical thought process" , "argument" .)

I've seen this clue in The Telegraph.
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