Having supper first, farmer is more calm (7)

I believe the answer is:

stiller

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'more calm' is the definition.
('still' can be similar in meaning to 'calm')

'having supper first farmer' is the wordplay.
'having supper first' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'farmer' becomes 'tiller' (I've seen this before).
's'+'tiller'='STILLER'

'is' is the link.

Can you help me to learn more?

(Other definitions for stiller that I've seen before include "Moving less" , "Calmer" , "Trellis (anag)" .)

I've seen this clue in The Hindu.

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