Type of acid trip curtailed in Islington clubs? (6)
I believe the answer is:
nitric
'type of acid' is the definition.
(I've seen this in another clue)
'trip curtailed in islington clubs?' is the wordplay.
'curtailed' means to remove the last letter.
'in' means one lot of letters goes inside another.
'islington' becomes 'NI' (resembles N1, Islington postcode).
'clubs?' becomes 'c' (abbreviation used in card games such as bridge).
'trip' with its last letter taken off is 'tri'.
'ni'+'c'='nic'
'tri' inserted into 'nic' is 'NITRIC'.
(Other definitions for nitric that I've seen before include "Of or containing nitrogen" , "Very corrosive acid type" , "Colourless highly corrosive acid" , "Citrin (anag.)" , "Common type of acid" .)