Despite a potential comeback at the beginning of the second half, Trinity were unable to handle Inchicore's attacking prowess.
Trinity students Caitriona Horan and Ellie O'Gorman are in a provisional 35-player squad to take on the UK in April.
After withstanding continual pressure for much of the game, DUAFC edged out table-toppers Lucan FC thanks to a late penalty from Ronan Hanaphy.
Clontarf's attacking prowess was too much for DUHC in what was a big game for two teams vying for promotion.
Trinity played host to Colours this weekend in the Sports Centre.
A superb final quarter helped Trinity overcome table-toppers Queen's and take another step towards an EYHL promotion spot.
DUFC rescued a losing bonus point from a 24-18 defeat to Young Munster in Tom Clifford Park today.
Despite a valiant effort, Trinity's golfers exited the Irish Colleges Matchplay Series in the quarter-finals on Thursday afternoon.
Trinity's athletes finished third overall at the IUAA Cross-Country Championships in Galway this weekend.
A 19-10 win over Port Dara Falcons means Trinity will compete for league silverware on March 23rd.