Joins junior diplomats (8)

I believe the answer is:

attaches

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This might be a double definition.

'joins' is the first definition.
(I've seen this before)

'junior diplomats' is the second definition.
'attaches' can be an answer for 'diplomats' (I've seen this in another clue). I'm unsure of the 'junior' bit.

Can you help me to learn more?

(Other definitions for attaches that I've seen before include "Fastens or joins" , "ties" .)

I've seen this clue in The Independent.

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