Tranquillisers I swallowed during operations (7)
I believe the answer is:
opiates
'tranquillisers' is the definition.
I can't judge whether this defines the answer.
'i swallowed during operations' is the wordplay.
'swallowed' becomes 'ate' (swallow can mean to eat).
'during' means one lot of letters goes inside another.
'operations' becomes 'ops' (abbreviation).
'i'+'ate'='iate'
'iate' inserted within 'ops' is 'OPIATES'.
Can you help me to learn more?
(Other definitions for opiates that I've seen before include "Branch of narcotics" , "Poppy-derived drugs" , "Narcotic drugs" , "Makes dull" , "Drugs that dull the feelings, sedatives" .)