Crossword Genius

Meticulous firm promises to hide identity (10)

Ross

I believe the answer is:

fastidious

'meticulous' is the definition.
(similar in meaning)

'firm promises to hide identity' is the wordplay.
'firm' becomes 'fast' (synonyms).
'promises' becomes 'ious' (IOU's, promises to pay a debt).
'to hide' is an insertion indicator.
'identity' becomes 'id' (I've seen this in other clues).
'fast'+'ious'='fastious'
'fastious' enclosing 'id' is 'FASTIDIOUS'.

(Other definitions for fastidious that I've seen before include "Attentive to detail" , "Meticulous" .)

I've seen this clue in The Guardian.
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