Infrared screens not seen very often (4)
I believe the answer is:
rare
'seen very often' is the definition.
I can't judge whether this definition defines the answer.
'infrared screens' is the wordplay.
'screens' says the answer is hidden in the clue.
'RARE' is hidden within 'infrared'.
'not' acts as a link.
Can you help me to learn more?
(Other definitions for rare that I've seen before include "Ben Jonson was considered so" , "like gold dust" , "Very infrequent or scarce" , "'Unusual, uncommon (4)'" , "Not well done!" .)