Crossword Genius

Security device left at church (5)

Ross

I believe the answer is:

latch

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

'security device' is the definition.
'latch' can be an answer for 'device' (latch is a kind of device). I am not certain of the 'security' bit.

'left at church' is the wordplay.
'left' becomes 'l' (common abbreviation).
'church' becomes 'ch' (common abbreviation).
'l'+'at'+'ch'='LATCH'

Can you help me to learn more?

(Other definitions for latch that I've seen before include "Small bar for fastening a door" , "Something to secure" , "Door catch" , "Gate fastener" , "Device to hold door shut" .)

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