Swimming in Calder: situation far from grave? (6)
I believe the answer is:
cradle
'situation far from grave?' is the definition.
(I've seen this before)
'swimming in calder' is the wordplay.
'swimming in' is an anagram indicator.
'calder' with letters rearranged gives 'CRADLE'.
(Other definitions for cradle that I've seen before include "'When the bough breaks, the . . . . . . will fall'" , "Baby's cot" , "Infant's bed" , "early bed" , "Hold tenderly" .)