Repeat it's a matter of tear and tie (7)
I believe the answer is:
iterate
'repeat' is the definition.
(I know that repeat can be written as iterate)
'of tear and tie' is the wordplay.
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'and' says to put letters next to each other.
'tear' after 'tie' is 'tietear'.
'tietear' is an anagram of 'ITERATE'.
'it's a matter' 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 iterate that I've seen before include "Say again, repeat" , "State repeatedly, say again" , "Recapitulate" , "Utter or perform repeatedly" , "Repeat, state again" .)