In no hurry to take refreshment, delays things (5,2)

I believe the answer is:

slows up

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'in no hurry to take refreshment' is the definition.
I can't judge whether this definition defines the answer.

'delays things' is the wordplay.
'delays' becomes 'slows' (I've seen this in another clue).
'things' becomes 'up' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'slows'+'up'='SLOWS UP'

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I've seen this clue in the Evening Standard.

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