Six-footer in Moldovan trip (3)
I believe the answer is:
ant
'six-footer' is the definition.
(ants have six feet)
'in moldovan trip' is the wordplay.
'in' indicates a hidden word.
'ANT' can be found hidden inside 'moldovan trip'.
(Other definitions for ant that I've seen before include "Colonial insect?" , "The insect lives in a social colony" , "Emmet or pismire" , "Worker on the hill" , "A soldier, for one" .)