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10a Armed vessel you casually note in attack(7)
????O?T

15a It can be frustrating, (Your'e telling me!!) mate(3)
R?T

10d Grab bags to throw off on travels (13)
??O?E?R?T?I?G

15a RUT
10d GLOBETROTTING
10a GUNBOAT

Attack is GO AT
You casually is U
Note is NB
Altogether gives GUNBOAT

RUT = mate, in a rut = frustrating

Grab is GET, throw is LOB, off is ROTTING
Put together as the clue describes gives GLOBETROTTING = travels

Thank you both for the answers and the explanations. I don't think laterally enough for this man!