It's about getting 1,000 on old boat, say (6)
I believe the answer is:
remark
'say' is the definition.
(I know this)
'it's about getting 1000 on old boat' is the wordplay.
'it's about' becomes 're' ('re' means regarding or about).
'getting' is a charade indicator (letters next to each other).
'r000' becomes 'M' (Roman numeral).
'on' says to put letters next to each other.
'old boat' becomes 'ark'.
're'+'m'+'ark'='REMARK'
(Other definitions for remark that I've seen before include "Comment or mention" , "Make mention of" , "Say as a comment" , "Comment, observation" , "Written or spoken comment" .)