Uncontrolled sheep puts pressure on worker (7)

I believe the answer is:

rampant

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'uncontrolled' is the definition.
(similar in meaning)

'sheep puts pressure on worker' is the wordplay.
'sheep' becomes 'ram' (male sheep).
'puts pressure on' becomes 'p' (I am not sure about this - if you are sure you should believe this answer much more).
'worker' becomes 'ant' (worker is a type of ant).
'ram'+'p'+'ant'='RAMPANT'

Can you help me to learn more?

(Other definitions for rampant that I've seen before include "On the rampage" , "Out of control" , "Unbridled" , "Growing or spreading uncontrollably" , "Unrestrained, flourishing excessively" .)

I've seen this clue in The Daily Express.

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