Bristol, for example, pursues pressure on gold shortage (7)
I believe the answer is:
paucity
'shortage' is the definition.
(I've seen this before)
'bristol for example pursues pressure on gold' is the wordplay.
'bristol for example' becomes 'city' (bristol is a kind of city).
'pursues' says to put letters next to each other.
'pressure' becomes 'p' (abbreviation).
'on' says to put letters next to each other.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'p'+'au'='pau'
'city' put after 'pau' is 'PAUCITY'.
(Other definitions for paucity that I've seen before include "Shortage" , "Poverty" , "deficiency" , "Insufficiency, dearth" , "Dearth, scarcity" .)