Link it up with Orient, this match (3)
I believe the answer is:
tie
'link' is the definition.
(synonyms)
'it up with orient this match' is the wordplay.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'with' means one lot of letters go next to another.
'orient this match' becomes 'e' (I am not sure about this - if you are sure you should believe this answer much more).
'it' in reverse letter order is 'ti'.
'ti'+'e'='TIE'
Can you help me to learn more?
(Other definitions for tie that I've seen before include "Gentleman's item of clothing" , "Equal scores" , "Attach, fasten" , "Fasten, link to" , "item round neck" .)