Evidence of delivery time given by shop informally (7,5)
I believe the answer is:
stretch marks
'by shop informally' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'evidence of delivery time' is the wordplay.
I cannot quite see how this works, but
'evidence' could be 'mark' (mark is a kind of evidence) and 'mark' is present in the answer.
'time' could be 'stretch' (I've seen this before) and 'stretch' is found in the answer.
A single letter 's' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'given' is the link.
Can you help me to learn more?
(Another definition for stretch marks that I've seen is " maternal lines".)