### Clue: Restrict saucy thing – tart not available to climb inside (8)
### Answer: HANDICAP 
 ### Explanation: Definition: Restrict
 HP(the brand name of the brown sauce most popular in the UK) **containing**(… inside) **reversal of**(… to climb, in a down clue) [ ACID(tart;sharp to the taste) + N.A.(abbrev. for "not available") ].