Crossword Genius

Tending to sit son beside garden, sits near rocks (13)

Ross

I believe the answer is:

sedentariness

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

'tending to sit' is the definition.
I can't judge whether this defines the answer.

'son beside garden sits near rocks' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'beside' says to put letters next to each other (I've seen this in other clues).
'garden' becomes 'eden' (I've seen this in another clue).
'rocks' is an anagram indicator.
'sits'+'near'='sitsnear'
'sitsnear' with letters rearranged gives 'tariness'.
's'+'eden'+'tariness'='SEDENTARINESS'

Can you help me to learn more?

I've seen this clue in The Telegraph.
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