Measured temperature in beloved person rising (5)
I believe the answer is:
rated
'measured' is the definition.
(rating is a kind of measuring)
'temperature in beloved person rising' is the wordplay.
'temperature' becomes 't' (abbreviation).
'in' indicates putting letters inside.
'beloved person' becomes 'dear' (I've seen this in another clue).
'rising' says the letters should be written in reverse (going up in a down clue).
't' inserted inside 'dear' is 'detar'.
'detar' written backwards gives 'RATED'.
(Other definitions for rated that I've seen before include "Highly valued" , "Scolded - valued" , "given a dressing-down" , "Admired" , "Taxed" .)