Flabby adipose tissue, primarily (3)

I believe the answer is:

fat

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'flabby adipose tissue primarily' is the definition.
I can't judge whether this definition defines the answer.

'flabby adipose tissue primarily' is the wordplay.
'primarily' indicates taking the first letters.
The initial letters of 'flabby adipose tissue' is 'FAT'.

Can you help me to learn more?

(Other definitions for fat that I've seen before include "Overweight, stout" , "Corpulent; little (chance)" , "Profitable" , "Excess body weight" , "As Bunter" .)

I've seen this clue in The Guardian.

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