Crossword Genius

A low-key state of mind (4)

Ross

I believe the answer is:

mood

'state of mind' is the definition.
(I've seen this before)

'a low-key' is the wordplay.
'a low' becomes 'moo' (I've seen this before).
'key' becomes 'd' (I've seen this in other clues**).
'moo'+'d'='MOOD'

(Other definitions for mood that I've seen before include "Feeling of doom" , "sullenness may be indicative" , "Humour - bad temper" , "at times appears very high" , "State of mind or emotion" .)

I've seen this clue in the Evening Standard.
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