Instrument seen during family reunion (4)
I believe the answer is:
lyre
'instrument' is the definition.
(lyre is a kind of instrument)
'during family reunion' is the wordplay.
'during' indicates a hidden word.
'LYRE' is hidden within 'family reunion'.
'seen' is the link.
(Other definitions for lyre that I've seen before include "Ancient Greek stringed instrument" , "Ancient stringed musical instrument with U-shaped frame" , "Ancient harp-like instrument" , "Old instrument, like a harp" , "Old stringed instrument" .)