Around capitals for students learning lots (and field trips) (5)
I believe the answer is:
falls
'trips' is the definition.
(fall is a kind of trip)
'around capitals for students learning lots and field' is the wordplay.
'around' is a reversal indicator.
'capitals for' suggests taking the first letters (I've seen 'capital for' mean this).
The first letters of 'students learning lots and field' is 'sllaf'.
'sllaf' written backwards gives 'FALLS'.
(Other definitions for falls that I've seen before include "Goes down" , "Forces" , "Plummets" , "American seasons" , "See 6 Down" .)