Solved clues about one singular scale (7)
I believe the answer is:
celsius
'scale' is the definition.
(I have seen 'Scale of temperature ' mean 'celsius' so perhaps 'scale' could also mean 'celsius')
'solved clues about one singular' is the wordplay.
'solved' indicates anagramming the letters (the anagram must be solved).
'about' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'clues' after 'i' is 'iclues'.
'iclues' is an anagram of 'celsiu'.
'celsiu'+'s'='CELSIUS'
(Other definitions for celsius that I've seen before include "Temperature scale named after Swedish astronomer" , "Scale of temperature devised by Swedish astronomer" , "alternative to F spelt out?" , "Swedish astronomer, deviser of the centigrade thermometer" , "Freezing point is 0 degrees on this scale" .)