Crossword Genius

Enthused when master entered and made concrete (6,2)

Ross

I believe the answer is:

firmed up

'made concrete' is the definition.

'enthused when master entered' is the wordplay.
'enthused' becomes 'firedup'.
'when master' becomes 'm' (I am not sure about the 'when' bit.**).
'entered' is an insertion indicator.
'firedup' enclosing 'm' is 'FIRMED UP'.

'and' is the link.

I've seen this clue in The Guardian.
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