Some players at Twickers rifle kitbag (8)
I believe the answer is:
rucksack
'some players at' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'twickers rifle kitbag' is the wordplay.
I cannot really understand how this works, but
'rifle' could be 'sack' (I've seen this before) and 'sack' is found within the answer.
The remaining letters 'ruck' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for rucksack that I've seen before include "A hiker's backpack carrier" , "Hiker's bag" , "Hiking bag" , "Trekker's baggage" , "traveller's bag" .)