Just a travelling entertainment (4)
I believe the answer is:
fair
This clue might be a double definition.
'just' is the first definition.
(just can mean fair in the sense of showing justice)
'a travelling entertainment' is the second definition.
'fair' can be an answer for 'entertainment' (as in a fun fair). I'm unsure of the 'a travelling' bit.
Can you help me to learn more?
(Other definitions for fair that I've seen before include "Equitable, just (4)" , "[OPPOSITE OF] Dark" , "light headed" , "Impartial, so-so" , "Attractive type of weather?" .)