Picaroon's supporting football club in transition period (7)

I believe the answer is:

interim

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'transition period' is the definition.
'interim' can be an answer for 'period' (interim is a kind of period). I'm not certain of the 'transition' bit.

'picaroon's supporting football club' is the wordplay.
'picaroon's' becomes 'I'm' (where the crossword setter is 'Picaroon').
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'football club' becomes 'Inter' (Inter Milan football club).
'im' put after 'inter' is 'INTERIM'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for interim that I've seen before include "acting" , "temporary period" , "Meantime; temporary" , "Temporary - provisional" , ", I'm put in grave situation initially" .)

I've seen this clue in The Guardian.

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