Postpones days out (6)

I believe the answer is:

delays

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'postpones days out' is the definition.
'delays' can be an answer for 'postpones' (I've seen this before). I am not sure about the 'days out' bit.

'postpones days out' is the wordplay.
'postpones' becomes 'el' (I can't explain this - if you can you should give a lot more credence to this answer).
'out' is an insertion indicator.
'el' inserted within 'days' is 'DELAYS'.

Can you help me to learn more?

(Other definitions for delays that I've seen before include "Stays or postponements" , "Stoppages" , "Retards or procrastinates" , "From waits" , "Postpones or holds back" .)

I've seen this clue in the Evening Standard.

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