Worried, skipping question that's simple (4)
I believe the answer is:
easy
'simple' is the definition.
(associated in meaning)
'worried skipping question' is the wordplay.
'worried' becomes 'queasy' (both can mean anxious).
'skipping' is a deletion indicator.
'question' becomes 'qu'.
'queasy' with 'qu' removed is 'EASY'.
'that's' is the link.
(Other definitions for easy that I've seen before include "Undemanding" , "Straightforward" , "Simple (like the living in 1 across)" , "Achieved without effort" , "Promiscuous" .)