Head of force in demand over church security (7)
'security' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'head of force in demand over church' is the wordplay.
'head of' says to take the initial letters.
'in' indicates putting letters inside.
'demand' becomes 'need' (synonyms).
'over' is a reversal indicator.
'church' becomes 'ce' (abbreviation for Church of England).
The first letter of 'force' is 'f'.
'f' placed within 'need' is 'nefed'.
'nefed' reversed gives 'defen'.
Can you help me to learn more?
(Other definitions for defence that I've seen before include "Military protection", "Protection from danger", "One ministry", "shelter", "Weaponry, possibly".)