Crossword Genius

Male relative one in semi-religious order? (4-7)

Ross

I believe the answer is:

half-brother

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

'male relative' is the definition.
'half brother' can be an answer for 'relative' (thesaurus). I'm unsure of the 'male' bit.

'one in semi-religious order?' is the wordplay.
I cannot really understand how this works, but
'one' could be 'the' (both can introduce a definite example of something) and 'the' is found within the answer.
'semi' could be 'half' ('semi' means 'half') and 'half' is found in the answer.
'order?' could be 'o' (abbreviation e.g. in British honours OM, OBE etc.) and 'o' is found within the answer.
The remaining letters 'brr' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for half-brother that I've seen is " One sharing one parent".)

I've seen this clue in The Times.
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