Garble a complicated mathematical subject (7)
I believe the answer is:
algebra
'mathematical subject' is the definition.
'algebra' can be an answer for 'subject' (algebra is a kind of subject). I'm unsure of the 'mathematical' bit.
'garble a complicated' is the wordplay.
'complicated' is an anagram indicator (a complex or confusing ordering of the letters).
'garble'+'a'='garblea'
'garblea' anagrammed gives 'ALGEBRA'.
Can you help me to learn more?
(Other definitions for algebra that I've seen before include "Branch of maths - real bag (anag)" , "'Branch of mathematics, uses letters and symbols (7)'" , "Maths with letters representing numbers" , "Branch of mathematics using letters and symbols" , "subject with many unknowns" .)