Old person irons tattered trousers expertly, initially (6)
I believe the answer is:
senior
'old' is the definition.
(I know that old can be written as senior)
'irons tattered trousers expertly initially' is the wordplay.
'tattered' indicates anagramming the letters.
'trousers' indicates putting letters inside (trouser can mean to steal or take).
'initially' says to take the initial letters.
The initial letter of 'expertly' is 'e'.
'irons' is an anagram of 'snior'.
'snior' placed around 'e' is 'SENIOR'.
'person' is the link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for senior that I've seen before include "More advanced in years or authority" , "Higher in status" , "Elder person - higher in rank" , "Elder (of two)" , "Being old" .)