The oldest member of unsettled Leeds first team (6)
I believe the answer is:
eldest
'the oldest' is the definition.
(I've seen this before)
'unsettled leeds first team' is the wordplay.
'unsettled' is an anagram indicator.
'first' says to take the initial letters.
The first letter of 'team' is 't'.
'leeds' is an anagram of 'eldes'.
'eldes'+'t'='ELDEST'
'member of' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for eldest that I've seen before include "Most advanced in years" , "most early in origin" , "Most aged" , "Most senior of a group" , "The oldest of three or more" .)