Pump gallons before turning over my small garden (3,4)
I believe the answer is:
gym shoe
'pump' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'gallons before turning over my small garden' is the wordplay.
'gallons' becomes 'G' (abbreviation).
'before' says to put letters next to each other.
'turning over' is a reversal indicator.
'small' becomes 's' (abbreviation - e.g. clothes size).
'garden' becomes 'hoe' (to garden could mean to hoe).
'my' back-to-front is 'ym'.
'g'+'ym'+'s'+'hoe'='GYM SHOE'
Can you help me to learn more?
(Another definition for gym shoe that I've seen is " It has gripping 'soul', you might say".)