Crossword Genius

London police, endless subject (5)

Ross

I believe the answer is:

theme

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

'subject' is the definition.
(theme can mean a topic or subject)

'london police endless' is the wordplay.
'london' becomes 'the' (I can't justify this - if you can you should give a lot more credence to this answer).
'police' becomes 'met' (London Metropolitan Police).
'endless' means to remove the last letter.
'met' with its final letter taken off is 'me'.
'the'+'me'='THEME'

Can you help me to learn more?

(Other definitions for theme that I've seen before include "Main idea or topic" , "A subject or repeated melody" , "Motif, topic" , "Subject (of talk, text, etc)" , "(Writer's) topic" .)

I've seen this clue in The Guardian.
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