Crossword Genius

Returning one day behind schedule, explain at length (6)

Ross

I believe the answer is:

dilate

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'schedule explain at length' is the definition.
I can't tell whether this definition defines the answer.

'returning one day behind' is the wordplay.
'returning' shows that the letters should be reversed in order.
'one' becomes 'i' (Roman numeral).
'day' becomes 'd' (abbreviation for day).
'behind' becomes 'late' (as in behind schedule).
'i'+'d'='id'
'id' back-to-front is 'di'.
'di'+'late'='DILATE'

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(Other definitions for dilate that I've seen before include "contract? No" , "Enlarge - detail (anag)" , "Expand - talk at length" , "Speak or write at length - widen" , "Widen as eye pupils may" .)

I've seen this clue in the Evening Standard.
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