Pressure on each group of teachers formerly to get something to eat (6)
I believe the answer is:
peanut
'something to eat' is the definition.
(I've seen this before)
'pressure on each group of teachers formerly' is the wordplay.
'pressure' becomes 'p' (abbreviation).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'each' becomes 'ea' (abbreviation).
'group of teachers formerly' becomes 'NUT' (National Union of Teachers, former teaching union).
'p'+'ea'+'nut'='PEANUT'
'to get' is the link.
(Other definitions for peanut that I've seen before include "little bit of food" , "sort of butter" , "Groundnut" , "Common snack" , "It ripens in a vine pod underground" .)