21 across
Soccer
goalkeeper
goofed
thus
(once
in
each
half)
(4)
Soccer goalkeeper goofed thus (once in each half) (4)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The definition is thus, meaning therefore, which ERGO conveys. The answer is hidden within "socc(ER GO)alkeeper", straddling the two words as hinted by "once in each half".