Half even enrol when you order them to (6)

I believe the answer is:

enjoin

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'you order them to' is the definition.
I can't tell whether this definition defines the answer.

'half even enrol' is the wordplay.
'half' indicates taking half.
'enrol' becomes 'join' (I've seen this in another clue).
'even' with half the letters taken is 'en'.
'en'+'join'='ENJOIN'

'when' is the link.

Can you help me to learn more?

(Other definitions for enjoin that I've seen before include "Instruct (someone to do something)" , "Issue an injunction" , "Prohibit by order" , "Impose an order upon" , "Direct with authority" .)

I've seen this clue in the Evening Standard.

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