Hideous thug, Lysander to some extent (4)

I believe the answer is:

ugly

'hideous' is the definition.
('ugly' can be similar in meaning to 'hideous')

'thug lysander to some extent' is the wordplay.
'to some extent' says the answer is hidden in the clue.
'UGLY' is hidden within 'thug lysander'.

(Other definitions for ugly that I've seen before include "Repulsive in appearance" , "Extremely unattractive" , "Unprepossessing, repulsive" , "not tasty?" , "Not pleasing to look at" .)

I've seen this clue in The Times.

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