Crossword Genius

Stressing that it's below the interior covering (11)

Ross

I believe the answer is:

underlining

'stressing' is the definition.
(underlining is a kind of stressing)

'it's below the interior covering' is the wordplay.
'it's below' becomes 'under' (synonyms).
'the interior covering' becomes 'lining' (I've seen this before).
'under'+'lining'='UNDERLINING'

'that' acts as a link.

(Another definition for underlining that I've seen is " Stressing".)

I've seen this clue in the Evening Standard.
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