Applause for head of organisation - one on about tax (7)
I believe the answer is:
ovation
'applause' is the definition.
(I've seen this in another clue)
'head of organisation one on about tax' is the wordplay.
'head of' suggests taking the first letters.
'one' becomes 'I' (Roman numeral).
'about' says to put letters next to each other.
'tax' becomes 'vat' (British sales tax).
The first letter of 'organisation' is 'o'.
'i'+'on'='ion'
'ion' put after 'vat' is 'vation'.
'o'+'vation'='OVATION'
'for' acts as a link.
(Other definitions for ovation that I've seen before include "Clapping" , "Long period of applause" , "Plaudits" , "Great outburst of applause" , "Enthusiastic and loud applause (sometimes standing)" .)