Pressure to produce milk, short of time? Calm down! (7)
I believe the answer is:
placate
'calm down' is the definition.
(placating is a kind of calming down)
'pressure to produce milk short of time?' is the wordplay.
'pressure' becomes 'p' (abbreviation).
'to produce milk' becomes 'lactate' (I've seen this before).
'short of' is a deletion indicator.
'time?' becomes 't'.
'lactate' with 't' taken out is 'lacate'.
'p'+'lacate'='PLACATE'
(Other definitions for placate that I've seen before include "Make less angry" , "Make calm, conciliate" , "Calm, pacify, appease" , "Mollify, calm down" , "Pale cat could pacify" .)