Crossword Genius

Head of force in demand over church security (7)

Ross

I believe the answer is:

defence

I'm a little stuck... Click here to teach me more about this clue!

'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'.
'defen'+'ce'='DEFENCE'

Can you help me to learn more?

(Other definitions for defence that I've seen before include "See 12" , "Protection from danger" , "team of lawyers" , "shelter" , "The D in MoD" .)

I've seen this clue in The Telegraph.
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