Rock music hit number two in chart (4)

I believe the answer is:

goth

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'rock music' is the definition.
(I know that goth is a type of rock music)

'hit number two in chart' is the wordplay.
'hit' becomes 'got' (I can't explain this - if you can you should give a lot more credence to this answer).
'number two in chart' becomes 'h' (ond letter of 'chart').
'got'+'h'='GOTH'

Can you help me to learn more?

(Other definitions for goth that I've seen before include "Rock music style" , "Rock music with gloomy lyrics" , "One of an ancient Germanic nation" , "Youngster clad in black" , "Teutonic barbarian" .)

I've seen this clue in The Times.

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