He's temporarily assigned support with central fees (8)

I believe the answer is:

secondee

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'he's temporarily assigned' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'support with central fees' is the wordplay.
'support' becomes 'second' (I've seen this before**).
'with' means one lot of letters go next to another.
'central' means to look at the middle letters.
The central letters of 'fees' are 'ee'.
'second'+'ee'='SECONDEE'

Can you help me to learn more?

(Another definition for secondee that I've seen is " One temporarily transferred to a new position".)

I've seen this clue in The Independent.

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