Rush out to the park for three-quarters of an hour (4)
I believe the answer is:
pour
'rush' is the definition.
(thesaurus)
'to the park for three-quarters of an hour' is the wordplay.
I cannot quite see how this works, but
'park' could be 'p' (abbreviation as on an automatic car's gear lever) and 'p' is present in the answer.
'of' could be 'o' and 'o' is found within the answer.
The remaining letters 'ur' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'out' acts as a link.
Can you help me to learn more?
(Other definitions for pour that I've seen before include "Dispense (e.g. tea)" , "(Of rain) fall heavily" , "Cause to flow as from pot to cup" , "Teem" , "to drop, when it's heavy" .)