Understand tenor's committed to one night in Paris (6)
I believe the answer is:
intuit
'understand' is the definition.
(I know that intuit is a more specific form of apprehend)
'tenor's committed to one night in paris' is the wordplay.
'tenor' becomes 't'.
'committed to' indicates putting letters inside (to commit can mean to imprison).
'one' becomes 'i' (Roman numeral).
'night in paris' becomes 'nuit' ('night' in French).
'i'+'nuit'='inuit'
't' inserted into 'inuit' is 'INTUIT'.
(Other definitions for intuit that I've seen before include "Work out by instinct" , "instinctive knowledge" , "Discover instinctively - Ti unit (anag)" , "makes sense" , "Perform (role) in exaggerated manner" .)