Tail truss modified for unselfish people (9)

I believe the answer is:

altruists

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'unselfish people' is the definition.
'altruists' can be an answer for 'people' (altruist is a kind of person). I'm unsure of the 'unselfish' bit.

'tail truss modified' is the wordplay.
'modified' indicates anagramming the letters.
'tail'+'truss'='tailtruss'
'tailtruss' with letters rearranged gives 'ALTRUISTS'.

'for' acts as a link.

Can you help me to learn more?

(Another definition for altruists that I've seen is " Philanthropists".)

I've seen this clue in the Sydney Morning Herald.

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