Imperial units of pressure removed from springs (6)
I believe the answer is:
ounces
'imperial units' is the definition.
'ounces' can be an answer for 'units' (ounce is a kind of unit). I'm unsure of the 'imperial' bit.
'pressure removed from springs' is the wordplay.
'pressure' becomes 'p' (scientific abbreviation).
'removed from' suggests deleting specific letters.
'springs' becomes 'pounces' (pounce is a kind of spring).
'pounces' with 'p' taken away is 'OUNCES'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for ounces that I've seen before include "Big cats and sixteenths of a pound" , "Small units of weight" , "Malay dagger" , "Light weights in UNESCO" , "Light weights or very small amounts" .)