Manifest expectancy in stands ringing large field (2,3,4)
I believe the answer is:
be all ears
'manifest expectancy' is the definition.
(to be all ears is to show eagerness to listen)
'stands ringing large field' is the wordplay.
'stands' becomes 'bears' ('bear' can be a synonym of 'stand').
'ringing' means one lot of letters goes inside another.
'large' becomes 'L' (eg in clothes sizes).
'field' becomes 'lea' (lea can mean a meadow or field of grass).
'l'+'lea'='llea'
'bears' going around 'llea' is 'BE ALL EARS'.
'in' acts as a link.
(Other definitions for be all ears that I've seen before include "Attend exclusively" , "Listen intently" .)