Prevailing feeling is low key (4)

I believe the answer is:

mood

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'prevailing feeling' is the definition.
'mood' can be an answer for 'feeling' (mood is a kind of feeling). I am unsure of the 'prevailing' bit.

'low key' is the wordplay.
'low' becomes 'moo' (both can mean to make a cow noise).
'key' becomes 'd' (musical key).
'moo'+'d'='MOOD'

'is' is the link.

Can you help me to learn more?

(Other definitions for mood that I've seen before include "at times appears very high" , "Temporary state of mind" , "Humour - bad temper" , "State of mind or feeling" , "melancholy" .)

I've seen this clue in The Times.

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