Crossword Genius

Test specialty model Den brought back (5,5)

Ross

I believe the answer is:

field trial

'test' is the definition.
(field trial is a kind of test)

'specialty model den brought back' is the wordplay.
'specialty' becomes 'field'.
'model' becomes 't' (Ford Model T car).
'den' becomes 'lair' ('lair' can be a synonym of 'den').
'brought back' shows that the letters should be reversed in order.
'lair' written backwards gives 'rial'.
'field'+'t'+'rial'='FIELD TRIAL'

I've seen this clue in The Independent.
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