Singly (3,2,1,4)
'singly' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for one at a time that I've seen before include "A-team, I note, travelling separately" , "Singly" , "Individually" .)
'singly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for once that I've seen before include "Long ago" , "in bygone days" , "Formerly - not repeated" , "Sometime" , "Formerly, at one time" .)
'singly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for each that I've seen before include "every individual" , "Every single one, person or thing" , "every one individually" , "Every one separately" , "Singly, per capita" .)
'singly' is the definition.
(I've seen this in another clue)
This is all the clue.
'singly' is the definition.
(synonyms)
This is all the clue.
(Other definitions for one by one that I've seen before include "Sequentially" , "Individually placed order" , "royal autobiography?" , "separately" , "Singly in order" .)
(Other definitions for apiece that I've seen before include "For or by each one of group" , "Per person" , "A head" , "for everyone" .)