Overweight boy's tie pulled out (7)

I believe the answer is:

obesity

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'overweight boy's tie pulled out' is the definition.
I can't tell whether this defines the answer.

'overweight boy's tie pulled out' is the wordplay.
'overweight' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'pulled' is an anagram indicator (letters pulled around).
'out' is an insertion indicator.
'boy'+'tie'='boytie'
'boytie' anagrammed gives 'obeity'.
's' placed into 'obeity' is 'OBESITY'.

Can you help me to learn more?

(Other definitions for obesity that I've seen before include "Excessive and unhealthy fatness" , "Abnormal fatness" , "Fatness to great excess" , "health issue" , "State of unhealthy overweight" .)

I've seen this clue in The Globe and Mail.

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