A tape recording? (11)
I believe the answer is:
measurement
'a tape recording?' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'tape recording?' is the wordplay.
'tape' becomes 'measure' (I've seen this before).
'recording?' becomes 'ment' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'measure'+'ment'='MEASUREMENT'
Can you help me to learn more?
(Other definitions for measurement that I've seen before include "Size" , "What a ruler may give" , "Mensuration" , "Dimension" .)