Crossword Genius

Losing time, ultimatums resolved, needing interdependence (9)

Ross

I believe the answer is:

mutualism

'interdependence' is the definition.
(I know that mutualism is a type of interdependence)

'losing time ultimatums resolved' is the wordplay.
'losing' indicates named letters should be taken away.
'time' becomes 't' (abbreviation).
'resolved' is an anagram indicator.
'ultimatums' with 't' removed is 'ulimatums'.
'ulimatums' anagrammed gives 'MUTUALISM'.

'needing' acts as a link.

I've seen this clue in The Everyman puzzle in The Observer.
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