We don't have synonyms for well in hand yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ball in hand.
(n) :
In billiards, a circumstance in which a fault by another player, such as a scratch, permits the competitor to take the cue ball in hand and place it anywhere on the table.
(n) :
In billiards, a circumstance in which a fault by another player, such as a scratch, permits the competitor to take the cue ball in hand and place it anywhere on the table.