Crossword Genius

Suit in church perhaps moved by sad tunes (6,4)

Ross

I believe the answer is:

sunday best

I'm a little stuck... Click here to teach me more about this clue!

'suit in church' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'moved by sad tunes' is the wordplay.
'moved' indicates anagramming the letters.
'by'+'sad'+'tunes'='bysadtunes'
'bysadtunes' anagrammed gives 'SUNDAY BEST'.

'perhaps' is the link.

Can you help me to learn more?

(Other definitions for sunday best that I've seen before include "Clothes kept for special occasions" , "Smartest clothes" , "smartest suit, say" , "clothes for the day after" , "One's finest outfit" .)

I've seen this clue in The Telegraph.
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