Write carelessly, seeing son grovel (6)
I believe the answer is:
scrawl
'write carelessly' is the definition.
(I've seen this before)
'son grovel' is the wordplay.
'son' becomes 's'.
'grovel' becomes 'crawl' ('crawl' can be a synonym of 'grovel').
's'+'crawl'='SCRAWL'
'seeing' is the link.
(Other definitions for scrawl that I've seen before include "Illegible hand" , "Hasty writing" , "Write untidily" , "Write clumsily, hardly legible" , "Poor handwriting" .)