Drunk guy grabs student: not a pretty sight (4)

I believe the answer is:

ugly

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'not a pretty sight' is the definition.
I can't tell whether this definition defines the answer.

'drunk guy grabs student' is the wordplay.
'drunk' indicates an anagram.
'grabs' indicates putting letters inside.
'student' becomes 'l' (as in L-plates for learner drivers).
'guy' anagrammed gives 'ugy'.
'ugy' going around 'l' is 'UGLY'.

Can you help me to learn more?

(Other definitions for ugly that I've seen before include "Hideous" , "Horrible" , "'Unattractive, unsightly (4)'" , "Disquieting" , "Not easy on the eye" .)

I've seen this clue in The Sun.

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