1 Blue Jay?
Frankfurter’s sure to be found in bundle of Australia’s flier? (4,3) Sure to Frankfurter (German) is Ja, in “Bluey”, Australian slang for pack or equipment- “Blue Jay”, flier?.
2. As the case may be?
Depending on the particular circumstances, carried by the traveller? (2.3.4.3.2)
3. Strop?
This pet is essential to revolutionary satrap or tsar – Reversed in clue strop means "pet"(5)
4. Thomas the Tank Engine?
Online cartoon character throws kitten among heathens (6,3,4,6). Is “on line” and anagram of “kitten among heathens”
5. Scaremongers?
Jitterbugs in Britain with dealer in cows (12)
Chambers gives Jitterbug in Britain as nervous person, scaremonger, Dealer - monger in scares - cows