Safeguard when English females enter city (9)
I believe the answer is:
sheffield
'city' is the definition.
(I've seen this before)
'safeguard when english females enter' is the wordplay.
'safeguard' becomes 'shield' (I've seen this in another clue).
'when english' becomes 'e' (abbreviation. I am not sure about the 'when' bit.).
'females' becomes 'ff' (an abbreviation for female written twice).
'enter' is an insertion indicator.
'e'+'ff'='eff'
'shield' placed around 'eff' is 'SHEFFIELD'.
Can you help me to learn more?
(Other definitions for sheffield that I've seen before include "S. Yorkshire city noted for cutlery" , "City famed for cutlery" , "Steel city" , "where the silver came from" , "City in northern England famous for its cutlery industry" .)