Tact displayed by papers turning on product of gland lacking energy (10)
I believe the answer is:
discretion
'tact' is the definition.
(thesaurus)
'papers turning on product of gland lacking energy' is the wordplay.
'papers turning on' becomes 'di' (I can't explain this - if you can you should believe this answer much more).
'product of gland' becomes 'secretion'.
'lacking' suggests deleting specific letters.
'energy' becomes 'e' (physics symbol as in E=mci).
'secretion' with 'e' removed is 'scretion'.
'di'+'scretion'='DISCRETION'
'displayed by' is the link.
Can you help me to learn more?
(Other definitions for discretion that I've seen before include "Diplomacy" , "Tact - prudence" , "Freedom to decide on an action" , "Liberty to act at pleasure; prudence" , "Tactful quality" .)