Relieve everybody on some days (5)

I believe the answer is:

allay

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'relieve' is the definition.
(synonyms)

'everybody on some days' is the wordplay.
'everybody' becomes 'all' (I've seen this before).
'on some days' becomes 'ay' (I can't justify this - if you can you should believe this answer much more).
'all'+'ay'='ALLAY'

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(Other definitions for allay that I've seen before include "Mollify or soothe, say fears" , "Calm fears" , "Lay to rest (fear)" , "Quell" , "Diminish (fears/concern)" .)

I've seen this clue in the Evening Standard.

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