Row after Irish festival gets more spirited (8)
I believe the answer is:
feistier
'more spirited' is the definition.
('feisty' can be similar in meaning to 'spirited')
'row after irish festival' is the wordplay.
'row' becomes 'tier' (a tier is a row of things).
'after' says to put letters next to each other.
'irish festival' becomes 'feis' (I've seen this in another clue).
'tier' put after 'feis' is 'FEISTIER'.
'gets' is the link.
(Other definitions for feistier that I've seen before include "More pugnacious" , "More spirited" .)