Sad song writer has kebab brought over during this time (10)

'sad song writer' is the definition.
The definition suggests a singular noun which matches the answer.

'kebab brought over during this time' is the wordplay.
'kebab' becomes 'doner' (I've seen this before).
'brought over' says the letters should be written in reverse.
'during' indicates putting letters inside.
'time' becomes 't' (abbreviation).
'doner' reversed gives 'renod'.
'renod' inserted into 'this' is 'threnodis'.
'threnodis'+'t'='THRENODIST'

'has' acts as a link.

Can you help me to learn more?