Sensory organ was not seen in cat, oddly absent (7)
I believe the answer is:
antenna
'sensory organ' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'was not seen in cat oddly absent' is the wordplay.
'oddly absent' indicates alternate letters (odd-numbered letters removed).
'was'+'not'+'seen'+'in'+'cat'='wasnotseenincat'
The alternating letters of 'wasnotseenincat' are 'ANTENNA'.
Can you help me to learn more?
(Other definitions for antenna that I've seen before include "sensitive feeler" , "Insect's feeler" , "Feature of dish" , "Radio aerial" , "Feeling part" .)