Pastry made from shortcrust mix: seconds wasted forgetting time and temperature (6)
I believe the answer is:
churro
'shortcrust mix seconds wasted forgetting time and temperature' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'pastry made from' is the wordplay.
I cannot quite see how this works, but
'from' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
The remaining letters 'churr' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for churro that I've seen is " deep-fried food".)